I've been here for about 3 years. Over the past 3 years these are the things I have learned about the 4.6 L 2 Valve Mustang GT
From 99 - 2001, the proven N/A mods were: Air Filter, gears, Shorty Headers, X or H pipe, Cat Back, Timing adjuster, Larger MAF, and pulleys.
Mods that were questionable were Cold air intakes and throttle bodies and chips.
From late 2001 to the present: Bullit Intake manifold, Intake plenum and throttle body, long tube headers, plasma booster, and P-51 Intake Manifold.
These common bolt-ons have resulted in 99 + GT's with 255-275 RWHP. 300 RWHP is all but impossible in a N/A 99 and up car without head work and cams.
Then there is Forced induction. Vortech S-Trim, Paxton Novi and ATI
rocharger are the most popular. With a safe tune allot of cars have between 350-400 + RWHP. In the beginning, these superchargers required a dyno tune and a piggyback Chip.
Later came the Ford-Cosworth-Steeda Technology Transfer program. The Tech Transfer Program allows the tuner to reflash the car's ECU instead of using a chip. The reflash results in more power and a safer tune. Testament to that is all of the Cobra Killers with 400 + rwhp on stock internals.
Now there is the Kenne Bell TwinScrew Super charger. There are a few stangers here on stangnet that are posting impressive numbers with the Kenne Bell superchargers.
Nitrous, I have not paid much attention to Nitrous. I know there are dry kits, wet kits and now there's a direct port injection kit. A proper tune, window switch, Wide-open throttle sensor, remote bottle opener, and bottle warmer are popular with Nitrous set-ups.
There are also a few turbo kits available for 4.6L Mustangs. There seem to be a small number of Stangers that run turbos.
96 – 98 stangs benefit from the same mods as the 99 and up cars. The most beneficial mod for these cars is the PI head swap. 99 and up stangs are equipped with PI heads. Many 96-98 Stangs with the PI Headswap are posting more impressive numbers than the 99 and up cars.
That's about it. I'm sure I am missing something.
From 99 - 2001, the proven N/A mods were: Air Filter, gears, Shorty Headers, X or H pipe, Cat Back, Timing adjuster, Larger MAF, and pulleys.
Mods that were questionable were Cold air intakes and throttle bodies and chips.
From late 2001 to the present: Bullit Intake manifold, Intake plenum and throttle body, long tube headers, plasma booster, and P-51 Intake Manifold.
These common bolt-ons have resulted in 99 + GT's with 255-275 RWHP. 300 RWHP is all but impossible in a N/A 99 and up car without head work and cams.
Then there is Forced induction. Vortech S-Trim, Paxton Novi and ATI
rocharger are the most popular. With a safe tune allot of cars have between 350-400 + RWHP. In the beginning, these superchargers required a dyno tune and a piggyback Chip.Later came the Ford-Cosworth-Steeda Technology Transfer program. The Tech Transfer Program allows the tuner to reflash the car's ECU instead of using a chip. The reflash results in more power and a safer tune. Testament to that is all of the Cobra Killers with 400 + rwhp on stock internals.
Now there is the Kenne Bell TwinScrew Super charger. There are a few stangers here on stangnet that are posting impressive numbers with the Kenne Bell superchargers.
Nitrous, I have not paid much attention to Nitrous. I know there are dry kits, wet kits and now there's a direct port injection kit. A proper tune, window switch, Wide-open throttle sensor, remote bottle opener, and bottle warmer are popular with Nitrous set-ups.
There are also a few turbo kits available for 4.6L Mustangs. There seem to be a small number of Stangers that run turbos.
96 – 98 stangs benefit from the same mods as the 99 and up cars. The most beneficial mod for these cars is the PI head swap. 99 and up stangs are equipped with PI heads. Many 96-98 Stangs with the PI Headswap are posting more impressive numbers than the 99 and up cars.
That's about it. I'm sure I am missing something.
I was getting kinda tired of searching all the time to make these same observations before buying my new mods. Thanks 
by one of them.
